Sure, but travelling on those systems takes a long time. When I lived in London a 1 hour commute was seen as totally normal. That was by train and I had a very direct single overground train to take (Kentish town to Chiswick if I remember).
BART is loud, rattly, screechy, wobbly, and generally feels like it could fall apart any moment. I wonder if even third world countries are able to produce trains that bad. But in developed parts of the world, trains are quiet and clean and run smoothly.
In general when Americans say they don't like public transit, they mean they don't like American public transit, because it is so badly done in America.
The proposal here isn't to do public transit better, though. It's to get more people to use the existing, shitty public transit by pricing them out of driving.